Compasses.



J. NOVAK.

COMPASSES.

APPLICATION FILED MAY 4. 1914.

Patented May 25, 1915.

www @www mwmwmq Hammam 'inaaaea JOHN NGVAK, 0F CHICAGO, XLLINOS.

COMPASSES.

Specification of Letters Patent.

Patented May 25, 1915.

Application led May 4, 1914.-. Serial No. 836,225,

l To all 'whom it may concern.'

zen of the United States, residing in the cityl or" Chicago, county'of Cook, and State of Illinois, have invented new and useful Compasses for use by draftsmen, carpenters, and other craftsmen needing this kind of an instrument at their labor, of which the followin is a speciiication.

y invention relates to Compasses for draftsmens or mechanics use, one of its objects being to provide simple means for maintaining the operating legs of the compass continuously insubstantially parallel positions.

Another object is to provide simple means for enabling the Compasses to be both quickly and accurately adjusted to any desired spread within their range, and for indicating the spread of the tips of the legs without requiring the latter to be separately measured by means of a rule.

Still another object is to provide simple means for preventing lost motion between the slidably mounted portions of the legs of the Compasses and the guides for the same.

Further objects will be ap arent from the following specicationand rom the accompanying drawings, in which:

Figure --1- is a front elevation of a pair of Compasses embodying my invention. Fig. -2- is a side elevation of the same taken from the right hand of Fig. -1-. Fig. -3- is a plan view of the Compasses. Fig. -4-'is a fragmentary detail View of the scale forming part of the handle member and of the slide and pivot member engaging the said scale.l Fig. -5- is a fragmentary section through one of the pivoted guides carried by the main arms of tlie compass and the shank of the leg guided thereby.

In the drawings, the Compasses include a pair of arms 1 pivotally ,'oined at their upper ends to a Common pivot 19, each of said arms having a guide 3 pivoted thereto iiear the other end of said arm. Slidably mounted in a perforation in each of the said guides is the shank 4 of one of the legs ot' the compass, each of which legs preferably consists of a shank portion equipped at its lower end with a socket adapted to receive the upper end of the tip portion of the corresponding leg. The tip portions used may be varied according to the purpose for which the Compasses arebeing used and may be interchangeably secured to the said sockets by means of screws 7 Thus, Fig. -1- shows a pointed tip 8a mounted upon one shank member 4 and a pen point 8b mounted upon the other. Each of the said shank portions of the legs is equipped at its upper end with a pivot 5 connecting the same with the other end of a link 2, which link is connected intermediate of its ends by a pivot 6 to one of the arms 1 intermediate of the ends of the latter. The inner ends of the said arms 2 are ointly connected by a pivotscrew carried by a member 11 which is equipped with a vertical slot. Sti'addling the pivot 19 at the juncture of the arms 1 is a fork comprising a horizontal portion 9 and a pair of vertically depending arms 10, the former of which arms rextends slidably through the said slot in the member 11. Attached to the horizontal portion 9 of the said forked member is a substantially cylindrical handle portion 12, which portion 12, together with the said forked member, comprise the handle member of my compasses. lt will be obvious from the drawings that upon changing the relative angularity of the arms l, the links 2 will coperatewith the sliding engagement of the Shanks 4 of the leg members and the guides 3 to maintain the said leg members substantially parallel with each other and with the portions 12 and 10 of the handle member; also that in so doing, the relative movement of the arms 1 will be accompanied by a vertical movement of the slot member 11 with respect to the handle portion 10 projecting therethrough. To utilize this movement in saving time for the yuser of my Compasses,

I enable'the user to readily set his compasses `according to this scale, therebyrobviating the necessity ofhis applying the tips of the compasses to a ruler or the like for-ascertaining the desired spacing.

vvTo avoid accidental shiftingof the movable' members of fthe Compasses, whereby c' the spacing of the legs would'be altered, I- A [equip the. arms Q1With suitable vspacer means; as fior exam le, an arcuate spacer 13 slidably mounte in slots in the revspective Aarms 1. y'In so doing, Ipreferabl z equip one-ofthe said'arms with a thum screw 14: whereby the said arm 'may be firmly locked to thesaid spacer, and prefferably equip the other armwitha worm wheel 15 ,engagingv corr onding teeth upon an adjacent portion o the saidl spacer member, the llatter-being continuously yheld in lirmengagement with the said worm by la spring 16 mounted upon the adjacent arm v 1. Upon loosening the thumb screw 14, they spacer member will be freeto slidethrough l the slot 13 carrying'the said screw, so that vthe compasses may be. quickly adjusted to approximately the desired 'spacing Then upon tightening theVv screw 14,'the Yvarious members of the compasses will be substantially locked against movement, although a' limited adjustment may still be secured by manually rotating the Vworm* 15, and by equipping the'said worm andthe adjacent rack or teeth upon the spacer 13 with rela-v tively small cooperating formations, I am able to provide a quite sensitivev adjustment for my Compasses while still permittinga quick approximatev adjustment thereof.

To prevent a lost motion of'thet` shanks 4 of the leg members with respect to the guides 3, which lost motion might lead to both a rattling and an indefinite or variable spacing of the tips of the Compasses, I prei .ferably interpose a spring 17 between 'the shank 4 and adjacent ortion of the arm 1. However, Ido not wis to be limited tothis or other details of the construction as herein disclosed, as the same might be varied in i many respects without departing from the relative movement.

2. Compasses, including a handle member, a pair of arms each pivoted at one end thereto, a pair of legs, means slidably connectingsaid legs respectively with the other ends of said arms, a pair of links pivotally connected at one end to the handle member and atvtheir other endsV respectively to the said legs, 'each of said links pivoted intermediate of its ends to .one of thesaid arms,

spacermeans associated with said arms Yfor locking the latter against relative move- Vment, and adjusting means associatedwithl the said spacer means for imparting alim*- thus locked.

vaCompasses, including a handldmember, a pair of arms each pivotedrat one end thereto, a'pair'ofv legs, means slidably connecting said legs respectivel with the other ends of said arms, apair o? connected at one end'to the 'ns Y -ited lrelative movement to the arms when links pivotally j handle member Vand at their other ends respectively to the Asaidlegs, each of said links pivotedintera5:

mediate of its ends to one of the said arms, Y

and indicating. means associated with the' handle'member and the vsaidvlinks for indi-"1 catin the spread of the tips of the legs. 4. l ompasses, includingv a Vhandle meinthereto, a pair of legs, means'slidably connecting said legs respectively with the other ends of said arms, a slide carriedby the handle member, and a pair of links pivotally connected yat one end to the said slideandl at their other ends respectively to the said legs, each of. saidjlinks pivoted intermediate of its ends to one of the said arms'.

- 5. Compasses, including a handle mem-' roo ber, a pair of arms each pivoted at one end thereto, a pair of legs, means slidably connecting said legsrespectively with the other ends of said arms,7al slide. carriedl b'yfthe handle member, and a pair f links pivotally connected at one endV to the 'said slide and at their other ends respectively .to the said legs, each of said links pivoted intermediate ofits ends to one of theV said arms, said handle memberequipped with a scale,said slide presenting an'indicating edge coperating with said scale toindicate the spread of the tips of the legs. v

6. Compasses, including a handle member,

.a pair of arms each plvoted atv one end thereto, a pair of guides pivotally mounted respectively `upon the sa1d arms near the vother ends thereof: a pair of legs equipped.

with Shanks slidably'itting theV said guides, the said handle member equipped with a portion extending downwardly in the same general direction as the said legs; a pivot member slidably' mounted on the'v said por-k tion of the handle member, and a pair of links respectively connecting the said pivot memberl and the upperends of the said legs, jV each of said links pivoted intermediate of its ends to one of the said arms.

7. Compasses, including a pair of arms pivotally joined at their' upper ends, apair ao ber, apair of arms each pivoted at one end f memset.

of links respectively pivoted u on said arms and pivot means affording a substantially intermediate of the ends of t e said arms pivotal connect1on between the lnner ends and said links, a air of guides respectively ofthe said links.

pivoted upon the ree ends of the said arms; JOHN NOV 5 a pair of legs pivoted respectively to the Witnesses:

outer ends of the said links and sldably MAX STUPAR,

mounted respectively in the said guides; JOHN GoLoB. 

